Estimation of purity for a quantum harmonic oscillator initially prepared in a displaced thermal state
Articolo
Data di Pubblicazione:
2012
Citazione:
Estimation of purity for a quantum harmonic oscillator initially prepared in a displaced thermal state / M. Brunelli, S. Olivares, M. Paternostro, M.G.A. Paris. - In: INTERNATIONAL JOURNAL OF QUANTUM INFORMATION. - ISSN 0219-7499. - 10:8(2012), pp. 1241015.1-1241015.10. [10.1142/S0219749912410158]
Abstract:
We address the estimation of purity for a quantum oscillator initially prepared in a displaced thermal state and probed by a suitably prepared qubit interacting with the oscillator via Jaynes-Cummings Hamiltonian without the rotating-wave approximation. We evaluate the quantum Fisher information (QFI) and show that optimal estimation of purity can be achieved by measuring the population of the qubit after a properly chosen interaction time. We also address the estimation of purity at fixed total energy and show that the corresponding precision is independent of the presence of a coherent amplitude. © 2012 World Scientific Publishing Company.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Quantum estimation; Physics and Astronomy (miscellaneous)
Elenco autori:
M. Brunelli, S. Olivares, M. Paternostro, M.G.A. Paris
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